Angular JS中未显示文本

我有这样的代码，它应该显示一个h4，如果搜索查询与任何字符串都不匹配，则表示没有产品。我现在有一个奇怪的错误，我的文本没有显示。它在html和css（控制台）中可用，在我单击绑定了click（）的元素或在css（控制台中编辑颜色后即可工作。有人知道这可能是什么吗？我怎么能解决这个问题？我试过很多东西，但似乎都无济于事？

我是这样添加的->

<h4 ng-show="filteredItems.length == 0"  class="explanation">We found no products</h4>

css

h4 {
    color: #ccc;
    text-align: center;
    padding: 100px 20px;
  }

搜索

$scope.searchItem = function( query ) {
    foundItems = [];
    query.toLowerCase();
    if( searchTimeout )
      $timeout.cancel( searchTimeout );
    searchTimeout = $timeout( function() {
      for( var i = 0; i < $scope.items.length; i++ ) {
        if( $scope.items[i].name.toLowerCase().indexOf( query ) > -1 ) 
          foundItems.push( $scope.items[i] );
      }
      $scope.filteredItems = foundItems;   
    }, 400);
  }

编辑

    // fill with dummy data
      $scope.define = function() {
        var random;
        for( var i = 0; i < 114; i++ ) {
          random = Math.floor(Math.random() * 6) + 1;
          var text;
          switch( random ) {
            case 1:
                text = 'Double espresso';
                break;
            case 2:
                text = 'Frappuccino cookie crumble chocolate'
                break;
            case 3:
              text = 'Cappuccino'
                break;
            case 4:
              text = 'Very Berry Hibiscus Starbucks Refreshers™ Beverage'
              break;
            case 5:
              text = 'Clover® Brewed Coffee Coffee Traveler'
              break;
            case 6:
              text = 'Featured Dark Roast'
              break;
            default:
                text = 'Not defined'
          }
          $scope.data.items.push( { name: text, image: random } );
        }
// THIS LINE CAUSES THE PROBLEM ( uncommented everything works )
        //$scope.data.filteredItems = $scope.data.items;
      }
      $scope.define();